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Constitutive laws

The material behaviour of geomaterials is described by us on the basis of present research findings, and further customised for engineering practice. Our constitutive laws are based on the following modules and can be extended upon request. Currently, the following modules are available.


Possible range of applications for our constitutive laws

  • Para-elastic material behaviour applied in combination with monotonic strain history can illustrate non linear behaviour of geomaterials under small strains (for example, as done in the commercialised HS-Small model).
  • Triple material hardening can be applied for the accumulation of plastic strains under cyclic loading.
  • The consideration of complex failure criterions (for example, Matsuoka-Nakai or Hoek-Brown) in models with plastic hardening allows for a realistic modelling of soil and rock.
  • Direct implementation of the safety factor in the failure criterion, also for non linear failure criterions. For example, the Hoek-Brown criterion allows arbitrary design geometries even in the case of complex constitutive laws.
Constitutive laws
Linear elastic Perfekt plasticity Mohr-Coulomb Explicit
Hyperelastic Volumetric Hardening Matsuoka-Nakai Implicit
Hypoelastic Deviatoric Hardening Drucker-Prager Full Newton
Viskoelastic Kinematic Hardening Lade Samll-strain stiffness
Paraelastic Viskoplasticity (creep) Hoek-Brown
    Shear strength reduction Anisotropic swelling
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